| Title: | Chemically activated hydrochar as an effective adsorbent for volatile organic compounds (VOCs) |
| Author(s): | Zhang X; Gao B; Fang J; Zou W; Dong L; Cao C; Zhang J; Li Y; Wang H; |
| Address: | "School of Environmental Engineering, Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, Xuzhou University of Technology, Xuzhou 221018, China; Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA; Jiangsu Key Laboratory of Environmental Material and Environmental Engineering, Yangzhou University, Yangzhou 225009, China. Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA. Electronic address: bg55@ufl.edu. Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA. Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA; Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China. Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, China; Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China. School of Environmental Engineering, Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, Xuzhou University of Technology, Xuzhou 221018, China. Jiangsu Key Laboratory of Environmental Material and Environmental Engineering, Yangzhou University, Yangzhou 225009, China. Tropical Research and Education Center, University of Florida, Homestead, FL 33031, USA. School of Environment and Chemical Engineering, Foshan University, Foshan, Guangdong 528000, China; School of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou, Zhejiang 311300, China" |
| DOI: | 10.1016/j.chemosphere.2018.11.144 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Hydrochars derived from hickory wood and peanut hull through hydrothermal carbonization were activated with H(3)PO(4) and KOH to improve their performance as a volatile organic compound (VOC) adsorbent. Polar acetone and nonpolar cyclohexane were used as representative VOCs. The VOC adsorptive capacities of the activated hydrochars (50.57-159.66 mg?nag(-1)) were greater than that of the nonactivated hydrochars (15.98-25.36 mg?nag(-1)), which was mainly caused by the enlargement of surface area. The significant linear correlation (R(2) = 0.984 on acetone, and R(2) = 0.869 on cyclohexane) between BET surface areas of hydrochars and their VOC adsorption capacities, together with the obvious adsorption exothermal peak of differential scanning calorimetry curve confirmed physical adsorption as the dominating mechanism. Finally, the reusability of activated hydrochar was tested on H(3)PO(4) activated hickory hydrochar (HHP), which had higher acetone and cyclohexane adsorption capacities. After five continuous adsorption desorption cycles, the adsorptive capacities of acetone and cyclohexane on HHP decreased by 6.2% and 7.8%, respectively. The slight decline in adsorption capacity confirmed the reusability of activated hydrochar as a VOC sorbent" |
| Keywords: | Acetone *Adsorption Carbon/chemistry Charcoal/*chemistry Cyclohexanes Phosphoric Acids Volatile Organic Compounds/*chemistry/isolation & purification Air pollution control Carbon sorbents Desorption Hydrothermal conversion Sorption VOC removal; |
| Notes: | "MedlineZhang, Xueyang Gao, Bin Fang, June Zou, Weixin Dong, Lin Cao, Chengcheng Zhang, Jian Li, Yuncong Wang, Hailong eng England 2018/12/05 Chemosphere. 2019 Mar; 218:680-686. doi: 10.1016/j.chemosphere.2018.11.144. Epub 2018 Nov 23" |
